The name is the name of the property ("java.home",
"os.name", etc). The naming
convention follows the hierarchical property naming convention.
Also, an asterisk
may appear at the end of the name, following a ".", or by itself, to
signify a wildcard match. For example: "java.*" or "*" is valid,
"*java" or "a*b" is not valid.

The actions to be granted are passed to the constructor in a string containing
a list of zero or more comma-separated keywords. The possible keywords are
"read" and "write". Their meaning is defined as follows:

read

read permission. Allows System.getProperty to
be called.

write

write permission. Allows System.setProperty to
be called.

The actions string is converted to lowercase before processing.

Care should be taken before granting code permission to access
certain system properties. For example, granting permission to
access the "java.home" system property gives potentially malevolent
code sensitive information about the system environment (the Java
installation directory). Also, granting permission to access
the "user.name" and "user.home" system properties gives potentially
malevolent code sensitive information about the user environment
(the user's account name and home directory).

PropertyPermission

Creates a new PropertyPermission object with the specified name.
The name is the name of the system property, and
actions contains a comma-separated list of the
desired actions granted on the property. Possible actions are
"read" and "write".

getActions

Returns the "canonical string representation" of the actions.
That is, this method always returns present actions in the following order:
read, write. For example, if this PropertyPermission object
allows both write and read actions, a call to getActions
will return the string "read,write".

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